Silencing cover for machines



March 4, 19-30. R. N. BAXTER ET AL 1,749,177

' SILENCING COVER FOR MACHINES Filed Jan. 18. 1927 Patented Mar. 4, 1930UNITED STATES PATENT QFFICE ROY N. BAXTER, OF PORTLAND, AND BERT C. RUE,OF TIGARD, OREGON SILEN CING- COVER FOR REACHINES pplication filedJanuary 13, 1927 This invention relates generally to the art oftransmitting communications, and particularly to that branch thereofwhereby typewriting machines are automatically operated by telegraphwhereby telegraphic messages are transcribed and the transcriptis in theform of a typewritten sheet.

The main object of the invention is to pro vide an exceedingly simpleand efficient silencing cover for telegraphically operated automatictypewriting machines wherein practically no sounds are permitted toescape from the cover, and in which the operation of the machine can beas easily observed as if the cover were not in place.

The second object is to so construct the cover that it will completelysurround the typewriting machine and extend to the floor upon which themachine stands, thereby reducing to the minimum the opportunities forsounds to be transmitted to the surrounding atmosphere.

The third object is to so construct the cover that its upper portion maybe readily lifted off in order to give complete access to thetypewriting machine itself.

The fourth object is to provide a special kind of wall construction forthe cover which will be unusually eflicient in resisting the passage ofsound vibrations.

The fifth object is to make it possible tc employ batteries of automatictypewriters in ofiices in conjunction with manually operated machineswithout distracting the oper ators of such machines by the noise thatwould naturally accompany the use of a number of automatic machines ifsuch machines were not suitably equipped with silencing covers.

These, and other objects, will become more apparent from thespecification following as illustrated in the accompanying drawing inwhich:

Figure 1 is a perspective View of the silenc- 7 ing cover showing sameplaced over a typewritin machine and having a portion of its frontbroken away to disclose its construction. Figure 2 is a vertical sectiontaken along the line 22 in Figure 1 at a somewhat enlarged scale. Figure3 is a horizontal sec- Serial No. 181,933.

tion through a corner of a cover taken along the line 3-3 in Figure 1,also showing the construction.

Similar numbers of reference refer to similar parts throughouttheseveral views.

Referring in detail to the drawing, it will be observed that the coveritself consists of the sides 10 and 11 which, in this case, form asomewhat square box which is secured to the floor by means of theangular clips 12. Each of the members 10 and 11 is hollow and providedwith a felt lining 13 between which is an air space 14. At the bottomand top of each member 10 and 11 is a spacing strip 15, across which thefelt lining also extends. The corners are provided with upright posts 16which add rigidity to the structure.

above the box formed by the sides 10 and 11 is a small top sectionconsisting of the front 17 which is provided with the swivels 18 and thesides 19 which are provided with handles 20. The sides 19 are alsoprovided with grooves 21 for a glass 22 which forms the cover for theupper section. A back 23 connects the higher rear ends of the members19. The glass 22 rests on felt atall points at which it is supported.The glass 22 is made to slope, for convenience in observing theoperation of the machine and reading the matter being printed, as wellas to facilitate the removal of the printed matter from the machine.

The upper section is held in position by a strip 24; which completelysurrounds the cover and can be secured to either the upper or lowersections as seem most desirable. The union between the upper and lowersec tions is also sealed by means of felt.

lVhen it is desired to remove typewritten matter from the machine it isonly necessary to slide the glass cover 22 downwardly while performingthe operation and then return same to its original position.

Owing to the nature of the automatic ma chines ordinary silencing coverssuch as have been employed on typewriters would not be practical and itis for this reason that the special construction above described isemployed, and that the covers are extended to the floor itself insteadof terminating at the usual machine base.

We are aware that various types of silencing covers have beenconstructed in the past for diflerent types of machines; we therefore donot claim such devices broadly, but we do intend to cover all such formsand modifications thereof as fall fairly within the appended claim.

We claim:

A silencing cover consisting of a box adapted to rest upon the floorhaving its upper end open and having each side wall formed of spacedwall elements having their adjacent sides felt covered; a removablesection adapted to be mounted upon said box having an over-lappingconnection with said lower box member, the sides of said section slopingtoward the front and having grooves on their inner upper ed es; a glasscover for said section sli ably aced in said move and resting on thefront and back of said section; and havin felt pads placed between thecontacting si es of said glass and its supporting members.

ROY N. BAXTER BERT C. RUE.

